Negative electrode for solid electrolyte battery and solid electrolyte battery

Abstract

A negative electrode for a solid electrolyte battery includes a negative electrode active material, a first compound, and a second compound, wherein the first compound is A a E b G c X d . . . (1), the second compound is different from the first compound, and is at least one of LiX . . . (2) and Li a E b F g X d . . . (3), in Formulae (1) to (3), A is Li, or Li and Na or Ca, E is at least one element selected from the group consisting of Al, Sc, Y, Zr, Hf, and lanthanoids, G is a predetermined group, X is at least one element selected from the group consisting of F, Cl, Br, and I, and 0.5≤a<6, 0<b<2, 0.1<c≤6, 0<d≤6.1, 0.5≤e<6, 0<f<2, 1.3≤g≤6.1, and 0≤h≤6.1 are satisfied.

1 . A negative electrode for a solid electrolyte battery, comprising a negative electrode active material, a first compound, and a second compound,
 wherein the first compound is A a E b G c X d  . . . (1), and   wherein the second compound is different from the first compound, and is at least one of LiX . . . (2) and Li e E f F g X h  . . . (3),   wherein in Formula (1) to Formula (3),   A is Li, or Li and Na or Ca,   E is at least one element selected from the group consisting of Al, Sc, Y, Zr, Hf, and lanthanoids,   G is at least one group selected from the group consisting of OH, BO 2 , BO 3 , BO 4 , B 3 O 6 , B 4 O 7 , CO 3 , NO 3 , AlO 2 , SiO 3 , SiO 4 , Si 2 O 7 , Si 3 O 9 , Si 4 O 11 , Si 6 O 18 , PO 3 , PO 4 , P 2 O 7 , P 3 O 10 , SO 3 , SO 4 , SO 5 , S 2 O 3 , S 2 O 4 , S 2 O 5 , S 2 O 6 , S 2 O 7 , S 2 O 8 , BF 4 , PF 6 , BOB, (COO) 2 , N, AlCl 4 , CF 3 SO 3 , CH 3 COO, CF 3 COO, OOC—(CH 2 ) 2 —COO, OOC—CH 2 —COO, OOC—CH(OH)—CH(OH)—COO, OOC—CH(OH)—CH 2 —COO, C 6 H 5 SO 3 , OOC—CH=CH—COO, OOC—CH=CH—COO, C(OH)(CH 2 COOH) 2 COO, AsO 4 , BiO 4 , CrO 4 , MnO 4 , PtF 6 , PtCl 6 , PtBr 6 , PtI 6 , SbO 4 , SeO 4 , TeO 4 , HCOO, CN, and SCN,   X is at least one element selected from the group consisting of F, Cl, Br, and I, and   0.5≤a<6, 0<b<2, 0.1<c≤6, 0<d≤6.1, 0.5≤e<6, 0<f<2, 1.3≤g≤6.1, and 0≤h≤6.1 are satisfied.   
     
     
         2 . The negative electrode for a solid electrolyte battery according to  claim 1 ,
 wherein the second compound is provided between the negative electrode active material and the first compound.   
     
     
         3 . The negative electrode for a solid electrolyte battery according to  claim 1 ,
 wherein the second compound contains LiF.   
     
     
         4 . The negative electrode for a solid electrolyte battery according to  claim 1 ,
 wherein the second compound contains Li 2 ZrF 6 .   
     
     
         5 . The negative electrode for a solid electrolyte battery according to  claim 1 ,
 wherein the mass % of the first compound is larger than the mass % of at least one compound of the compound represented by Formula (2) and the compound represented by Formula (3).   
     
     
         6 . The negative electrode for a solid electrolyte battery according to  claim 1 ,
 wherein the mass % of the first compound is larger than the mass % of the second compound.   
     
     
         7 . The negative electrode for a solid electrolyte battery according to  claim 1 ,
 wherein, in a cross section cut in a lamination direction, the average particle size of the negative electrode active material is larger than the average particle size of at least one compound of the compound represented by Formula (2) and the compound represented by Formula (3).   
     
     
         8 . The negative electrode for a solid electrolyte battery according to  claim 1 ,
 wherein, in a cross section cut in a lamination direction, 30% or more of the length of the periphery of the negative electrode active material is covered with the second compound.   
     
     
         9 . A solid electrolyte battery, comprising the negative electrode for a solid electrolyte battery according to  claim 1 , a positive electrode, and a solid electrolyte layer that is provided between the negative electrode for a solid electrolyte battery and the positive electrode and contains a solid electrolyte. 
     
     
         10 . The solid electrolyte battery according to  claim 9 ,
 wherein the solid electrolyte is the same as the first compound.